NOW® Seasonal Rapid Relief features Enzymatically Modified Isoquercitrin, a clinically tested form of Quercetin with enhanced bioavailability. Studies have shown that it may support a balanced immune system response to seasonal or environmental factors and promote comfort through temporary soothing watery eyes. Enzymatically Modified Isoquercitrin exhibits up to 40 times greater absorption than Quercetin and reaches its peak levels typically within 30 minutes!